TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 888: Development of Roundabout Crash Prediction Models and Methods provides crash prediction models that quantify the expected safety performance of roundabouts for motorized and non-motorized road users. Safety performance factors (SPF) and crash modification factors (CMF) are predictive models that estimate expected crash frequencies. These models are used to identify locations where crash rates are higher than expected, to est...

TRB Special Report 330: Performance of Bridges That Received Funding Under the Innovative Bridge Research and Construction Program, examines the results of a federal program to promote innovation in highway bridge construction. The Innovative Bridge Research and Construction (IBRC) program, created by act of Congress, provided state departments of transportation with a total of $128.7 million in grants as incentives for use of innovative materials and technology to construct or repair approximately 400 b...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 528: Analyzing Data for Measuring Transportation Performance by State DOTs and MPOs summarizes what data state departments of transportation (DOTs) and metropolitan planning organizations (MPOs) are using and how they are measuring transportation performance. Knowledge about transportation data already exists, but may be fragmented, scattered, and unevaluated. This report synthesizes current knowledge and practice about data manag...

TRB's Airport Cooperative Research Program (ACRP) has released its 5-Year Research Impact Report. This report analyzes the research ACRP conducted between 2013-2017 and explores the impact of this research on the airport industry. It begins with an introduction to the publications that ACRP produced over the past 5 years and the topic areas on which these publications focus. This report also focuses on the instances in which people have engaged with ACRP research and for what purpose.

TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 891: Dedicating Lanes for Priority or Exclusive Use by Connected and Automated Vehicles identifies and evaluates opportunities, constraints, and guiding principles for implementing dedicated lanes for connected and automated vehicles. This report describes conditions amenable to dedicating lanes for users of these vehicles and develops the necessary guidance to deploy them in a safe and efficient manner. This analysis helps ident...

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publicaiton, non-edited version of Research Report 902: Benchmarking and Comparative Measurement for Effective Performance Management by Transportation Agencies. The report provides guidance and examples for how transportation agencies can ensure that benchmarking is effectively applied to enhance transportation system performance. Benchmarking—comparison of oneself with peers—has been successfully applied in many fields as a ...

TRB's Conference Proceedings 56: Socioeconomic Impacts of Automated and Connected Vehicles summarizes a symposium held in June 26–27, 2018, in Brussels, Belgium. Hosted by the European Commission and TRB, it was the sixth annual symposium sponsored by the European Commission and the United States. The goals of these symposia are to promote common understanding, efficiencies, and trans-Atlantic cooperation within the international transportation research community while accelerating transportation sector ...

TRB's Transportation Research Circular E-C242: A Literature Review of Rail Trespassing and Suicide Prevention Research reviews and summarizes available research reports and data sources related to the issues of railroad trespassing and suicide, focusing on research from 2013 onwards. This report explores incidences of rail-related trespassing and suicide based on several factors, including lethality, age, gender, and risk factors. It also discusses trespassing and suicide countermeasure findings.